java/src/main/java/com/konfigthis/newscatcherapi/client/ProgressResponseBody.java
/*
 * NewsCatcher News API V2
 * NewsCatcher is a data-as-a-service startup that has one main goal: to build the largest database of structured news articles published online. In other words, we're like Google for the news part of the web, which you can access as a source of data.  Some useful links: - [How NewsCatcher Works](https://docs.newscatcherapi.com/knowledge-base/how-newscatcher-works) - [GitHub for the Python SDK](https://github.com/NewscatcherAPI/newscatcherapi-sdk-python) 
 *
 * The version of the OpenAPI document: 1.0.1
 * Contact: hzdkv@example.com
 *
 * NOTE: This class is auto generated by Konfig (https://konfigthis.com).
 * Do not edit the class manually.
 */


package com.konfigthis.newscatcherapi.client;

import okhttp3.MediaType;
import okhttp3.ResponseBody;

import java.io.IOException;

import okio.Buffer;
import okio.BufferedSource;
import okio.ForwardingSource;
import okio.Okio;
import okio.Source;

public class ProgressResponseBody extends ResponseBody {

    private final ResponseBody responseBody;
    private final ApiCallback callback;
    private BufferedSource bufferedSource;

    public ProgressResponseBody(ResponseBody responseBody, ApiCallback callback) {
        this.responseBody = responseBody;
        this.callback = callback;
    }

    @Override
    public MediaType contentType() {
        return responseBody.contentType();
    }

    @Override
    public long contentLength() {
        return responseBody.contentLength();
    }

    @Override
    public BufferedSource source() {
        if (bufferedSource == null) {
            bufferedSource = Okio.buffer(source(responseBody.source()));
        }
        return bufferedSource;
    }

    private Source source(Source source) {
        return new ForwardingSource(source) {
            long totalBytesRead = 0L;

            @Override
            public long read(Buffer sink, long byteCount) throws IOException {
                long bytesRead = super.read(sink, byteCount);
                // read() returns the number of bytes read, or -1 if this source is exhausted.
                totalBytesRead += bytesRead != -1 ? bytesRead : 0;
                callback.onDownloadProgress(totalBytesRead, responseBody.contentLength(), bytesRead == -1);
                return bytesRead;
            }
        };
    }
}
